Centrifugal grinding-machine.



No. 664,85l. Patented Jan. I, I90l. W. W. GREEN.

CENTBIFUGAL GRINDING MACHINE.

(Application fllod Aug. 25, 1898.

2 Sheets-Sheot (No Model.)

Tn: warms men: on. PNOTO-UTNQ. vusamcm a c No. 664,85l. Patented Jan. I, 190i. W. W. GREEN.

CENTRIFUGAL GRINDING MACHINE.

v Application fllsd Aug. 25. 1898) (No Model.) 5 2 Sheets-Shut 2.

Urvrrnn States Patent rricn.

.VILLIAMI vV. GREEN, OF CHICAGO, ILLINOIS.

CENTREFUGAL GRINDING MACHlNL SPEGIFZGATION forming part of Letters Patent No. 664,851, dated January 1, 1901.

Application filed August 25, 1898. Serial No. 689,455. (No model.)

To a ZU7l/07I'b it; Duty concern:

Be it known that 1, WILLIAM W. GREEN, a citizen of the United States, residing at Ohicago, county of Cook, State of Illinois, have invented a new and useful Improvement in Centrifugal Grinding-Mills, of which the following is a specification.

The objects of the invention are to secure a stronger construction, greater convenience and simplicity in the knife-holding devices, more perfect closure of the knife-slots, and to secure the retention of material operated upon until and only until it has a predetermined degree of fineness.

In the accompanying drawings, Figure l is a perspective view of the complete machine. Fig. 2 is a section on the line 2 2, Fig. 3. Fig. is an end elevation looking to the right in Fig. 2, a portion of the casing being broken away. Fig. at is a section on the line et 4, Fig. Fig. 5 is a partial plan view, a portion of the casing being broken away. Fig. 6 is a perspective view showing devices for holding certain knives in place. Fig. 7 shows the same devices in cross-section, the plane of section passing through line 7 7, Fig. 2. Fig. 8 is a section of one of the spiders, the plane of section being indicated by the line 8 8, Fig. 4. Fig. 9 is a section on the line 9 9, Fig. 8.

In the figures, A and B designate, respectively, the rigid but detachably-united upper and lower parts of a horizontally-divided casing cylindrical in general form and closed at both ends. The part A is provided at one end with a chute a, surmounted by a hopper a and discharging into the end of the cylinder, and near the other end has its wall carried abruptly outward (so that the interior space is here materially enlarged) and formed into a neck or stub-pipe a surrounding a passage for the upward discharge of material placed in the hopper and passed through the cylinder. The part A is further provided with the upper halves of bearings for a shaft to be described. The part 13 carries corresponding lower halves b of the same bearings and is provided with legs 1) to support the machine. In these bearings runs a shaft C, lying in the axis of the cylinder, and within the casing a series of disks or spiders H are fixed to the shaft by set-screws h. Beaters or arms I fit in recesses respectively in chine cause an air-current from the hopper a to the discharge 0,

The lower half B of the cylinder is provided with longitudinal slots 6 upon opposite sides, and through these slots knives J project into the spaces between the heaters I. The outer end portions of the knives are held in transverse grooves in blocks K or K, which cover the slots 5 respectively, and overlap the easing upon one side only of the slot and have on this side a flange which is bolted to the overlapped part. The other side of the block is provided with transverse grooves filled by the knives and also with a longitudinal groove is, intersecting all the transverse grooves. Each knife is provided with a lateral notch j, registering with the groove 70 when the knife is in place, and the groove 70 and the notchesj are filled by a long key 70 An angle-iron k is bolted down upon the body of the block, the edges of the knives, and the key, rigidly binding all'together and forming for the block a second flange, which is bolted to the casing. The knives are thus rigidly supported upon all four sides by a broad bearing and are held accurately in place with absolute security, and at the same time the slot in the casing is perfectly closed by a device which connects the parts upon opposite sides of it, and thus restores practically the strength and rigidity of an unslotted cylinder, While dividing the strain of the knives between parts above and parts below.

It has been stated that the wall of the upper half of the cylinder is carried outward near the discharge end of the machine. The internal space thus gained is separated from the main cylindrical space by a semicylindrical screen D, Figs. 2, 3, and 5, forming practically a continuation of the cylindrical wall of the non-enlarged portion of the casing. Thus material after it is acted upon by the heaters and knives if fine enough to pass through the screen may escape at any point in the upper half of the circular path through which the heaters at this end of the machine carry it. Were the walls not carried outward the screen must be small and merely cover the discharge-opening a and in such case much material already sufficiently comminuted to pass the screen would fail to escape on its first presentation and would be again carried through the knives, producing needless and very objectionable congestion at this end of the machine. By the arrangement set forth, on the other hand, there is a free discharge. The final delivery-opening is small, and yet no material not of proper fineness can escape. If in any instance it should be desired to obstruct the discharge in any degree, the desired end may be reached by making use of a gate or valve E, mounted upon and adjusted by means of threaded rods F.

What I claim as new, and desire to secure by Letters Patent, is

The combination with the casing having the longitudinal slot through which knives may project within, of the flanged block bolted to the casing on one side of the slot, extending to the opposite side thereofand provided upon the free side with transverse grooves and a shallower groove intersecting the transverse grooves, knives completely filling the transverse grooves, respectively, and provided with notches registering with the shallower groove, a key completely filling the shallower groove and notches, an angle-iron, bolts securing the latter to the body of the block and binding it u pon the knives and key, and bolts binding the same member against the casing.

WILLIAM W. GREEN. 7 

